/* ==========================================================================
   zs-buttons.css — canonical button system for Zvjezdane Staze
   --------------------------------------------------------------------------
   Three variants, three sizes, consistent focus + disabled states.

   Variants:
     .zs-btn-primary    Forest fill, white text — primary action (Apply, Submit)
     .zs-btn-secondary  Forest border, transparent fill — secondary action
     .zs-btn-ghost      Underline only, no border — tertiary / inline links

   Sizes (modifier):
     .zs-btn-sm         Compact (table cells, card actions)
     (default)          Standard (most contexts)
     .zs-btn-lg         Hero CTA (landing, apply)

   Brand book §20 Buttons.
   ========================================================================== */


/* ----- Base — shared by all variants ----- */
.zs-btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-family: var(--font-sans);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    text-decoration: none;
    text-align: center;
    line-height: 1;
    border: 1px solid transparent;
    border-radius: 0;                 /* never rounded — brand is angular paper, not capsules */
    cursor: pointer;
    transition:
        background-color 0.3s ease,
        color 0.3s ease,
        border-color 0.3s ease,
        transform 0.2s ease,
        box-shadow 0.3s ease;
    white-space: nowrap;
    user-select: none;
}

.zs-btn:focus { outline: none; }

.zs-btn:focus-visible {
    outline: 2px solid var(--gold);
    outline-offset: 4px;
}


/* ----- Primary — forest fill, the canonical action ----- */
.zs-btn-primary {
    background: var(--forest);
    color: var(--bg);
    border-color: var(--forest);
}
.zs-btn-primary:hover {
    background: var(--forest-deep);
    border-color: var(--forest-deep);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(45, 74, 45, 0.2);
}
.zs-btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(45, 74, 45, 0.15);
}


/* ----- Secondary — forest border, transparent fill ----- */
.zs-btn-secondary {
    background: transparent;
    color: var(--forest);
    border-color: var(--forest);
}
.zs-btn-secondary:hover {
    background: var(--forest);
    color: var(--bg);
}


/* ----- Ghost — underline only, no border ----- */
.zs-btn-ghost {
    background: transparent;
    color: var(--forest);
    border-color: transparent;
    padding: 1rem 0.5rem;
    text-decoration: underline;
    text-decoration-color: var(--gold);
    text-decoration-thickness: 1px;
    text-underline-offset: 6px;
}
.zs-btn-ghost:hover {
    color: var(--magenta);
    text-decoration-color: var(--magenta);
}


/* ----- Sizes ----- */
/* zs-btn-sm: padding bumped 0.6rem→0.75rem to reach ~28px height.
   Earlier 22px height failed WCAG AA 24×24 minimum. (Mobile audit 2026-05-06.) */
.zs-btn-sm {
    padding: 0.75rem 1.6rem;
    font-size: 11px;
    letter-spacing: 0.14em;
}
.zs-btn-sm.zs-btn-ghost {
    padding: 0.75rem 0.6rem;
}

.zs-btn-lg {
    padding: 1.4rem 3.2rem;
    font-size: 13px;
    letter-spacing: 0.22em;
}
.zs-btn-lg.zs-btn-ghost {
    padding: 1.4rem 0.6rem;
}


/* ----- Disabled state ----- */
.zs-btn:disabled,
.zs-btn[aria-disabled="true"] {
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
    pointer-events: none;
}
.zs-btn-primary:disabled,
.zs-btn-primary[aria-disabled="true"] {
    background: var(--light);
    border-color: var(--light);
    color: var(--bg);
}
.zs-btn-secondary:disabled,
.zs-btn-secondary[aria-disabled="true"] {
    color: var(--light);
    border-color: var(--light);
}
.zs-btn-ghost:disabled,
.zs-btn-ghost[aria-disabled="true"] {
    color: var(--light);
    text-decoration-color: var(--light);
}


/* ----- Loading state ----- */
.zs-btn[aria-busy="true"] {
    cursor: wait;
    pointer-events: none;
    position: relative;
    color: transparent;
}
.zs-btn[aria-busy="true"]::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin-top: -8px;
    margin-left: -8px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    color: var(--bg);
    animation: zs-btn-spin 0.7s linear infinite;
}
.zs-btn-secondary[aria-busy="true"]::after,
.zs-btn-ghost[aria-busy="true"]::after {
    color: var(--forest);
}
@keyframes zs-btn-spin {
    to { transform: rotate(360deg); }
}


/* ----- With trailing icon (arrow → on CTA) ----- */
.zs-btn-with-icon {
    display: inline-flex;
    align-items: center;
    gap: 0.6em;
}
.zs-btn-with-icon svg,
.zs-btn-with-icon .zs-icon {
    width: 1em;
    height: 1em;
    flex: none;
}


/* ----- Reduced motion ----- */
@media (prefers-reduced-motion: reduce) {
    .zs-btn { transition: none; }
    .zs-btn:hover { transform: none; }
    .zs-btn[aria-busy="true"]::after { animation: none; }
}